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CLI11 v2.6.2 Release Notes

Release Date: 2026-02-26 // 4 months ago

  • 👍 This version adds C++20 modules support, additional controls for help output and
    🛠 finer grained control for extras handling and prefix command operation. Fixes
    🏁 compatibility issues with C++26 and Windows and a number of small issue with
    help output and specific combinations of options and conditions.

    ➕ Added

    • ➕ Added C++20 modules support with new module files and tests. #1286
    • ➕ Added configuration modes for extras handling: AssumeMultipleArguments and
      AssumeSingleArgument. #1270
    • ➕ Added option for full install including impl headers with precompiled option.
      #1252
    • ➕ Added improvements to prefix commands including PrefixCommandMode and
      separator specification. #1266
    • ➕ Added controls for option name formatting in help output, allowing disabling
      0️⃣ of default values, flags, and type names. #1247
    • ➕ Added refactor of Meson build system with updated version and new options.
      #1280
    • ➕ Added support for Bazel 9. #1287
    • ➕ Added module testing infrastructure. #1255

    🔄 Changed

    • 🔄 Changed default to install impl headers even when precompiled option is
      selected. #1291
    • ⚡️ Updated copyright dates to 2026. #1283
    • ⚡️ Updated CI pipelines including Azure Pipelines and GitHub workflows.
      #1267, #1283
    • 📚 Updated documentation and book chapters. #1250

    🛠 Fixed

    • 🛠 Fixed extra spaces in option and app descriptions. #1295
    • 🛠 Fixed option searching to use fallthrough in parent apps. #1292
    • 🛠 Fixed C++26 template ambiguity for std::complex. #1278
    • 🛠 Fixed UTF-8 config filenames not supported on Windows. #1273
    • 🛠 Fixed enumeration stream output generating unconvertible strings if certain a
      👉 user supplied stream conversion method was supplied #1261
    • 🛠 Fixed code simplification issues by removing use of static std::string which
      was causing some heap allocation issues when using CLI11 as part of DLL on
      certain operating systems #1244
    • Fixed MISRACPP2023-25_5_2-a-1 rule violation #1299

Previous changes from v2.6.1

  • 🚀 Patch fixing some compile issues in specific situations in the recent release,
    and a potential segmentation fault from specially crafted config files

    ➕ Added

    • ➕ Added CI tests for install and package management on macos-arm64 #1238

    🛠 Fixed

    • 🛠 Fixed incorrect links to validator examples. #1239
    • 🛠 Fixed incorrect inclusion of definition for extra validators #1238
    • 🛠 Fixed fuzz generated failure from crafted files introduced in recent release
      #1238
    • ✂ Removed some usage of static const std::string in inline function that had
      potential memory issues when CLI11 is used with shared libraries, this likely
      isn't a bug but the fix did result in smaller code size so was kept. #1244